The Sea of Åland (Finnish: Ahvenanmeri; Swedish: Ålands hav) is a waterway in the southern Gulf of Bothnia, between the Åland islands and Sweden. It connects the Bothnian Sea with the Baltic Sea proper. The seas are often choppy here. The narrowest part is named South Kvarken. The trench running on the bottom of the Sea of Åland contains the second-deepest spot of the Baltic Sea, at a depth of 301 meters, which is second only to Landsort Deep.
- Lasse Jansson (19 June 2014). "Vad hände sen med de gamla färjorna" (in Swedish). Aftonbladet. Retrieved 30 January 2016.